Ok, so i needed circular ViewPager. I was having really hard time to implement it. Now that i have implemented it and it is working fine as far as circular scroll is concern. But i have notice a problem.Which is, after first round of scroll fragments don't work. I have three Fragments with a button inside them. Button works in first round but when i come back to first page button doesn't work. p.s i used fake pages technique to make viewpager circular.
Here is code
mViewPager.setAdapter(new PagerAdapter(getSupportFragmentManager(), this));
//mViewPager.setOnPageChangeListener(new CircularViewPagerHandler(mViewPager));
mViewPager.setCurrentItem(1, false);
mViewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
if (position == 0) {
mViewPager.setCurrentItem(3, false);
Log.d("TAG",
"Swiped before first page, looping and resetting to last page.");
} else if (position == 4) {
mViewPager.setCurrentItem(1, false);
Log.d("TAG",
"Swiped beyond last page, looping and resetting to first page.");
}
}
@Override
public void onPageScrollStateChanged(int state) {
Log.d("onPageScrollState", "state:" + state);
int currentPage = mViewPager.getCurrentItem();
if(currentPage==1){
imgCenter.setImageResource(R.drawable.take_ride);
imgLeft.setImageResource(R.drawable.give_ride);
imgRight.setImageResource(R.drawable.setting);
}
if(currentPage==2){
imgCenter.setImageResource(R.drawable.setting);
imgRight.setImageResource(R.drawable.take_ride);
imgLeft.setImageResource(R.drawable.give_ride);
}
if (currentPage==3){
imgCenter.setImageResource(R.drawable.give_ride);
imgLeft.setImageResource(R.drawable.take_ride);
imgRight.setImageResource(R.drawable.setting);
}
}
});
here is PagerAdapter class
public class PagerAdapter extends FragmentPagerAdapter {
Context mcontext;
public PagerAdapter(FragmentManager fm, Context context) {
super(fm);
mcontext = context;
}
@Override
public Fragment getItem(int position) {
if (position == 0) {
return new HomeFragment2();
}
else if(position==1){
return new HomeFragment();
}
else if (position == 2) {
return new SettingFragment();
}
else if(position==3){
return new HomeFragment2();
}
else
return new HomeFragment();
}
@Override
public int getCount() {
return 5;
}
}
I've created a simple test-app with you PagerAdapter
and simple Fragment
s with a Button
:
And it works fine!
I've uploaded the source code here, so you can check it out and see if there's any difference with yours.
As a Fragment
's I used:
public class FragmentA extends android.support.v4.app.Fragment {
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_a, container, false);
rootView.findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Snackbar.make(v, "Hi, fragment A", Snackbar.LENGTH_SHORT).show();
}
});
return rootView;
}
}
So what I can recommend
replace your fragments with some dummy ones (like the one above). If it works - the issue is in the Fragment
code, not in the Circular ViewPager
If it still doesn't work - I'd try to instead of re-creating fragments multiple times - create them once and store:
public class PagerAdapter extends FragmentPagerAdapter {
Context mcontext;
Fragment [] fragments;
public PagerAdapter(FragmentManager fm, Context context, Fragment [] fragments) {
super(fm);
mcontext = context;
this.fragments = fragments;
}
@Override
public Fragment getItem(int position) {
return fragments[position];
}
@Override
public int getCount() {
return fragments.length;
}
}
And in Activity
:
Fragment[] fragments = {
Fragment.instantiate(this, FragmentC.class.getName()),
Fragment.instantiate(this, FragmentA.class.getName()),
Fragment.instantiate(this, FragmentB.class.getName()),
Fragment.instantiate(this, FragmentC.class.getName()),
Fragment.instantiate(this, FragmentA.class.getName()),
};
.....
viewPager.setAdapter(new PagerAdapter(getSupportFragmentManager(), this, fragments));
Let me know, if it helps!
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